I found this plant in a rooftop garden in Pittsburgh, PA. Any ideas as to what it is?

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I can't see the leaves, but if the picture was taken at the end of summer/autumn, it's probably Michaelmas Daisy.

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    aka Asters in North America. The key is the purple petals that resemble a daisy, around a yellow centre. And that they bloom in the fall. Apr 12 '14 at 18:58

Aster Azureus, A native aster. This would make a good roof-top plant because it tolerates very dry soil in full sun. http://www.prairienursery.com/store/native-plants/sky-blue-aster-aster-azureus

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